NULLITY
nullity
(noun) something that is null (especially an enactment that has no legal validity)
nothingness, void, nullity, nihility
(noun) the state of nonexistence
Source: WordNet® 3.1
Etymology
Noun
nullity (countable and uncountable, plural nullities)
The state of being null, or void, or invalid.
(legal) A void act; a defective proceeding or one expressly declared by statute to be a nullity.
(math) The difference between the rank of a matrix and the number of columns it has; the dimension of the nullspace of a matrix.
Source: Wiktionary
Nul"li*ty, n.; pl. Nullities. Etym: [LL. nullitias, fr. L. nullus
none: cf. F. nullité . See Null.]
1. The quality or state of being null; nothingness; want of efficacy
or force.
2. (Law)
Definition: Nonexistence; as, a decree of nullity of marriage is a decree
that no legal marriage exists.
3. That which is null.
Was it not absurd to say that the convention was supreme in the
state, and yet a nullity Macaulay.
Source: Webster’s Unabridged Dictionary 1913 Edition